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Commit f2f9e7f8 authored by Mathieu Poirier's avatar Mathieu Poirier
Browse files

coresight-tmc: Adding a status interface to sysfs 



Knowing the state of various control register is always
useful for degging and tuning.  As such add an entry in
sysfs that expose to userspace the most important registers.

Signed-off-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit a2d6e1849329b7735f2872af4221727c7b9502dd)
Signed-off-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
parent b252e546

drivers/coresight/coresight-tmc.c

+56 −0
Original line number Diff line number Diff line
@@ -565,6 +565,59 @@ static const struct file_operations tmc_fops = { 
	.llseek		= no_llseek,

};



static ssize_t status_show(struct device *dev,

			   struct device_attribute *attr, char *buf)

{

	int ret;

	unsigned long flags;

	u32 tmc_rsz, tmc_sts, tmc_rrp, tmc_rwp, tmc_trg;

	u32 tmc_ctl, tmc_ffsr, tmc_ffcr, tmc_mode, tmc_pscr;

	u32 devid;

	struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);



	ret = clk_prepare_enable(drvdata->clk);

	if (ret)

		goto out;



	spin_lock_irqsave(&drvdata->spinlock, flags);

	CS_UNLOCK(drvdata->base);



	tmc_rsz = readl_relaxed(drvdata->base + TMC_RSZ);

	tmc_sts = readl_relaxed(drvdata->base + TMC_STS);

	tmc_rrp = readl_relaxed(drvdata->base + TMC_RRP);

	tmc_rwp = readl_relaxed(drvdata->base + TMC_RWP);

	tmc_trg = readl_relaxed(drvdata->base + TMC_TRG);

	tmc_ctl = readl_relaxed(drvdata->base + TMC_CTL);

	tmc_ffsr = readl_relaxed(drvdata->base + TMC_FFSR);

	tmc_ffcr = readl_relaxed(drvdata->base + TMC_FFCR);

	tmc_mode = readl_relaxed(drvdata->base + TMC_MODE);

	tmc_pscr = readl_relaxed(drvdata->base + TMC_PSCR);

	devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);



	CS_LOCK(drvdata->base);

	spin_unlock_irqrestore(&drvdata->spinlock, flags);



	clk_disable_unprepare(drvdata->clk);



	return sprintf(buf,

		       "Depth:\t\t0x%x\n"

		       "Status:\t\t0x%x\n"

		       "RAM read ptr:\t0x%x\n"

		       "RAM wrt ptr:\t0x%x\n"

		       "Trigger cnt:\t0x%x\n"

		       "Control:\t0x%x\n"

		       "Flush status:\t0x%x\n"

		       "Flush ctrl:\t0x%x\n"

		       "Mode:\t\t0x%x\n"

		       "PSRC:\t\t0x%x\n"

		       "DEVID:\t\t0x%x\n",

			tmc_rsz, tmc_sts, tmc_rrp, tmc_rwp, tmc_trg,

			tmc_ctl, tmc_ffsr, tmc_ffcr, tmc_mode, tmc_pscr, devid);

out:

	return -EINVAL;

}

static DEVICE_ATTR_RO(status);



static ssize_t trigger_cntr_show(struct device *dev,

			    struct device_attribute *attr, char *buf)

{
@@ -593,18 +646,21 @@ static DEVICE_ATTR_RW(trigger_cntr); 


static struct attribute *coresight_etb_attrs[] = {

	&dev_attr_trigger_cntr.attr,

	&dev_attr_status.attr,

	NULL,

};

ATTRIBUTE_GROUPS(coresight_etb);



static struct attribute *coresight_etr_attrs[] = {

	&dev_attr_trigger_cntr.attr,

	&dev_attr_status.attr,

	NULL,

};

ATTRIBUTE_GROUPS(coresight_etr);



static struct attribute *coresight_etf_attrs[] = {

	&dev_attr_trigger_cntr.attr,

	&dev_attr_status.attr,

	NULL,

};

ATTRIBUTE_GROUPS(coresight_etf);